Catalyst CAT3643HL1-T2 3-channel ultra high efficiency quad-mode tm led driver Datasheet

CAT3643
3-Channel Ultra High Efficiency Quad-Mode™
LED Driver
FEATURES
DESCRIPTION
„ High efficiency 1.33x charge pump
The CAT3643 is a high efficiency quad-mode
fractional charge pump that can drive up to three
LEDs programmable by a one wire digital interface.
The inclusion of a 1.33x fractional charge pump mode
increases device efficiency by up to 10% over
traditional 1.5x charge pumps with no added external
capacitors.
„ Quad-mode charge pump: 1x, 1.33x, 1.5x, 2x
„ Drives up to 3 LEDs at 32mA each
„ 1-wire EZDim™ LED current programming
„ Power efficiency up to 92%
„ Low noise input ripple in all modes
Low noise input ripple is achieved by operating at a
constant switching frequency which allows the use of
small external ceramic capacitors. The multi-fractional
charge pump supports a wide range of input voltages
from 2.4V to 5.5V.
„ “Zero” current shutdown mode
„ Soft start and current limiting
„ Short circuit protection
„ Thermal shutdown protection
„ Tiny 12-lead XQFN, 12-lead TDFN and 16-lead
TQFN packages
The EN/DIM logic input functions as a chip enable and
a digital dimming interface for current setting of all
LEDs. Six different current ratios are available via the
interface.
APPLICATION
„ LCD Display Backlight
The device is available in the tiny 12-lead XQFN 2.5 x
2.5mm with max height of 0.4mm or in 16-lead TQFN
or 12-lead TDFN 3mm x 3mm package with a max
height of 0.8mm.
„ Cellular Phones
„ Digital Still Cameras
„ Handheld Devices
The 1.33x charge pump architecture with two fly
capacitors is patent pending.
ORDERING INFORMATION
Part
Number
Package
Package
Marking
CAT3643HV2-T2
TDFN-12 3 x 3mm(1)
CAT3643HV3-T2
(1)
HABF
TQFN-16 3 x 3mm
CAT3643HL1-T2 XQFN-12 2.5 x 2.5mm
JAAE
(1)
TYPICAL APPLICATION CIRCUIT
LB
1µF
Notes:
(1) Matte-Tin Plated Finish (RoHS-compliant)
(2)
Quantity per reel is 2000
C1+
VIN
2.4V
to
5.5V
For Ordering Information details, see page 16.
CIN
1µF
1-Wire
EZDimTM
Programming
3.8kΩ
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
C1- C2+
VIN
1µF
C2VOUT
White LEDs
VOUT
COUT
1µF
CAT3643
EN/DIM
LED1
RSET
LED2
GND
20mA
LED3
Doc. No. 5022, Rev. B
CAT3643
PIN CONFIGURATION
TDFN 12-lead 3 x 3mm
(Top View)
TQFN 16-lead 3 x 3mm
(Top View)
2
11 C2+
LED3
3
RSET
NC
LED2
NC
12 GND
GND
1
LED1
LED2
16
15
14
13
LED2
1
12 C2-
10 C2-
LED3
2
11 C2+
4
9 C1-
NC
3
10 C1-
EN/DIM
5
8 C2-
VOUT
6
7 VIN
RSET
4
9 C1+
5
6
7
8
EN/DIM
VOUT
NC
VIN
XQFN 12-lead 2.5 x 2.5mm
(Top View)
C2+
C1-
C1+
12
11
10
C2-
1
9 VIN
GND
2
8 VOUT
LED1
3
7 EN/DIM
4
5
6
LED2
LED3
NC
The CAT3643 is offered in three different packages.
The 12-lead TDFN 3mm x 3mm with a max height of
0.8mm is pin-compatible to the Catalyst CAT3603
LED driver. The 12-lead XQFN provides the smallest
Doc. No. 5022, Rev. B
footprint with a package size of 2.5mm x 2.5mm and
0.4mm max height. The 16-lead TQFN 3mm x 3mm
with max height of 0.8mm is also offered.
2
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3643
ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, LEDx, C1±, C2± voltage
VOUT voltage
EN/DIM voltage
Storage Temperature Range
Junction Temperature Range
Lead Temperature
Rating
6
7
6
-65 to +160
-40 to +125
300
Unit
V
V
V
°C
°C
°C
RECOMMENDED OPERATING CONDITIONS
Parameter
Rating
VIN
2.5 to 5.5
Ambient Temperature Range
-40 to +85
ILED per LED pin
0 to 25
Total Output Current
0 to 100
LED Forward Voltage Range
1.3 to 4.3
Typical application circuit with external components is shown on page 1.
Unit
V
°C
mA
mA
V
ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) VIN = 3.6V, EN = High, TAMB = 25°C
Symbol
IQ
IQSHDN
ILED-ACC
ILED-DEV
VRSET
Name
Conditions
Quiescent Current
1x mode, no load
1.33 x mode, no load
1.5x mode, no load
2x mode, no load
Shutdown Current
LED Current Accuracy
LED Channel Matching
RSET Regulated Voltage
ROUT
Output Resistance (open loop)
FOSC
Charge Pump Frequency
ISC_MAX
IIN_MAX
LEDTH
Output short circuit Current Limit
Input Current Limit
Min
Max
1.0
1.7
2.2
2.4
VEN = 0V
ILEDAVG / ILEDAVG-NOMINAL
(ILED - ILEDAVG) / ILEDAVG
±2
±1.5
0.6
0.62
0.8
5
5
10
1x mode
1.33x mode, VIN = 3V
1.5x mode, VIN = 2.7V
2x mode, VIN = 2.4V
0.8
1
1
1.3
50
250
Units
mA
mA
mA
mA
1
0.58
1.33x and 2x mode
1.5x mode
VOUT < 0.5V
VOUT > 1V
Typ
µA
%
%
V
Ω
Ω
Ω
Ω
1.3
1.6
MHz
MHz
mA
mA
1x to 1.33x or 1.33x to 1.5x or 1.5x to 2x
Transition Thresholds at any LED pin
130
mV
VHYS
1x Mode Transition Hysteresis
400
mV
TDF
Transition Filter Delay
500
µs
100
0.4
kΩ
V
V
2.0
°C
°C
V
REN/DIM
VHI
VLO
EN/DIM Pin
• Internal Pull-down Resistor
• Logic High Level
• Logic Low Level
TSD
THYS
VUVLO
Thermal Shutdown
Thermal Hysteresis
Undervoltage lockout (UVLO) threshold
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1.3
1.6
3
150
20
1.8
Doc. No. 5022, Rev. B
CAT3643
RECOMMENDED EN/DIM TIMING
For 2.4V ≤ VIN ≤ 5.5V, over full ambient temperature range -40ºC to +85ºC.
Symbol
Name
Conditions
TSETUP
EN/DIM setup from shutdown
10
TLO
EN/DIM program low time
0.2
THI
EN/DIM program high time
0.2
μs
TPWRDWN
EN/DIM low time to shutdown
1.5
ms
TLED
LED current settling time
TSETUP
Min
Typ
Max
Units
μs
100
40
μs
μs
TPWRDWN
THI
EN/DIM
TLED
TLO
100%
100%
50%
LED
Current
Shutdown
25%
12.5% 6.25%
3.12%
Shutdown
Figure 1. EN/DIM Digital Dimming Timing Diagram
Doc. No. 5022 Rev. B
4
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3643
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, IOUT = 60mA (3 LEDs at 20mA), CIN = COUT = C1 = C2 = 1μF, TAMB = 25°C unless otherwise specified.
Efficiency vs. Input Voltage
100
VF = 3.3V
1.5x
EFFICIENCY [%]
80
2x
70
60
60
40
40
4.2
2.0
4.0 3.8 3.6 3.4 3.2
INPUT VOLTAGE [V]
3.0
Quiescent Current vs. Input Voltage
Quiescent Current vs. Temperature
4.0
4.0
VF = 3.3V
3.0
2.0
1.0
LEDs Off
0.0
2x
2.0
1.0
VF = 3.3V
0.0
10
8
6
4
2
0
40
80
TEMPERATURE [°C]
120
VF = 3.3V
0
-2
-4
-6
-8
-10
-40
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE [V]
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1x
LED Current Change vs. Temperature
LED CURRENT VARIATION [%] .
10
8
6
4
2
0
-2
-4
-6
-8
-10
1.33x
-40
LED Current Change vs. Input Voltage
1.5x
3.0
5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0
INPUT VOLTAGE [V]
LED CURRENT VARIATION [%] .
1.33x
70
50
4.0
3.5
3.0
2.5
INPUT VOLTAGE [V]
1x
80
50
4.5
VF = 3.3V
90
1x
QUIESCENT CURRENT [mA]
EFFICIENCY [%]
100
1.33x
90
QUIESCENT CURRENT [mA]
Efficiency vs. Li-Ion Voltage
5
0
40
80
TEMPERATURE [°C]
120
Doc. No. 5022, Rev. B
CAT3643
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, IOUT = 60mA (3 LEDs at 20mA), CIN = COUT = C1 = C2 = 1μF, TAMB = 25°C unless otherwise specified.
Output Resistance vs. Input Voltage
12
1.3
1.2
OUTPUT RESISTANCE [Ω] .
SWITCHING FREQUENCY [MHz]
Switching Frequency vs. Temperature
1.5x Mode
1.1
1.0
0.9
1.33x, 2x Mode
0.8
0.7
-40
Doc. No. 5022, Rev. B
0
40
80
TEMPERATURE [°C]
2x
10
8
6
4
2
1.33x
1.5x
1x
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE [V]
120
Power Up in 1x Mode
Power Up in 1.33x Mode
Power Up in 1.5x Mode
Power Up in 2x Mode
6
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3643
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, IOUT = 60mA (3 LEDs at 20mA), CIN = COUT = C1 = C2 = 1μF, TAMB = 25°C unless otherwise specified.
Power Up Delay (1x Mode)
Power Down Delay (1x Mode)
Operating Waveforms in 1x Mode
Switching Waveforms in 1.33x Mode
Switching Waveforms in 1.5x Mode
Switching Waveforms in 2x Mode
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc. No. 5022, Rev. B
CAT3643
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, IOUT = 60mA (3 LEDs at 20mA), CIN = COUT = C1 = C2 = 1μF, TAMB = 25°C unless otherwise specified.
LED Current vs. LED Pin Voltage
Foldback Current Limit
40
1x Mode
3.5
LED CURRENT [mA]
OUTPUT VOLTAGE [V]
4.0
3.0
2.5
2.0
1.5
1.0
0.5
0.0
30
20
10
0
0
100
200
300
OUTPUT CURRENT [mA]
400
0
Dimming Waveform
50 100 150 200 250
LED PIN VOLTAGE [mV]
300
Line Transient Response
Disconnecting a Single LED
Doc. No. 5022 Rev. B
8
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3643
PIN DESCRIPTION
Name
Function
LED1
LED1 cathode terminal.
LED2
LED2 cathode terminal.
LED3
LED3 cathode terminal.
RSET
Connect resistor RSET to set the LED current.
EN/DIM
VOUT
Device enable (active high) and Dimming Control.
Charge pump output connected to the LED anodes.
VIN
Charge pump input, connect to battery or supply.
C1+
Bucket capacitor 1 Positive terminal
C1-
Bucket capacitor 1 Negative terminal
C2+
Bucket capacitor 2 Positive terminal
C2-
Bucket capacitor 2 Negative terminal
GND
Ground Reference
NC
GND
Not connected inside package.
Connect to GND on the PCB.
PIN FUNCTION
VIN is the supply pin for the charge pump. A small
1μF ceramic bypass capacitor is required between the
VIN pin and ground near the device. The operating
input voltage range is from 2.5V to 5.5V. Whenever
the input supply falls below the under-voltage
threshold (1.8V), all the LED channels are disabled
and the device enters shutdown mode.
C1+, C1- are connected to each side of the ceramic
bucket capacitor C1.
C2+, C2- are connected to each side of the ceramic
bucket capacitor C2.
LED1, LED2, LED3 provide the internal regulated
current sources for each of the LED cathodes. These
pins enter high-impedance zero current state whenever the device is placed in shutdown mode.
EN/DIM is the enable and one wire dimming input for
all LED channels. Levels of logic high and logic low
are set at 1.3V and 0.4V respectively. When EN/DIM
is initially taken high, the device becomes enabled
and all LED currents are set to the full scale according
to the resistor RSET. To place the device into “zero
current” shutdown mode, the EN/DIM pin must be
held low for at least 1.5ms.
TAB is the exposed pad underneath the package. For
best thermal performance, the tab should be soldered
to the PCB and connected to the ground plane.
RSET is connected to the resistor (RSET) to set the full
scale current for the LEDs. The voltage at this pin
regulated to 0.6V. The ground side of the external
resistor should be star connected back to the GND of
the PCB. In shutdown mode, RSET beomes high
impedance.
VOUT is the charge pump output that is connected to
the LED anodes. A small 1μF ceramic bypass
capacitor is required between the VOUT pin and
ground near the device.
GND is the ground reference for the charge pump. The
pin must be connected to the ground plane on the PCB.
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
9
Doc. No. 5022, Rev. B
CAT3643
BLOCK DIAGRAM
C1-
VIN
C1+
C2-
C2+
VOUT
1x mode (LDO)
1.33x, 1.5x, 2x Charge Pump
Mode Control
1, 1.3MHz
Oscillator
EN/DIM
LED1
100kΩ
LED2
Serial
Interface
Referece
Voltage
Registers
Current
Setting DAC
LED3
LED Channel
Current Regulators
RSET
GND
Figure 2. CAT3643 Functional Block Diagram
BASIC OPERATION
At power-up, the CAT3643 starts operating in 1x
mode where the output will be approximately equal
to the input supply voltage (less any internal voltage
losses). If the output voltage is sufficient to regulate
all LED currents, the device remains in 1x operating
mode.
If the input voltage is insufficient or falls to a level
where the regulated currents cannot be maintained,
the device automatically switches into 1.33x mode
(after a fixed delay time of about 400μs). In 1.33x
mode, the output voltage is approximately equal to
1.33 times the input supply voltage (less any internal
voltage losses).
Doc. No. 5022 Rev. B
The above sequence repeats in the 1.33x and 1.5x
mode until the driver enters the 2x mode. In 1.5x mode,
the output voltage is approximately equal to 1.5 times
the input supply voltage. While in 2x mode, the output is
approximately equal to 2 times the input supply voltage.
If the device detects a sufficient input voltage is present
to drive all LED currents in 1x mode, it will change
automatically back to 1x mode. This only applies for
changing back to the 1x mode. The difference between
the input voltage when exiting 1x mode and returning to
1x mode is called the 1x mode transition hysteresis
(VHYS) and is about 500mV.
10
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3643
LED Current Selection
At power-up, the initial LED current is set to full scale
(100% brightness) by the external resistor RSET as
follows:
0 .6 V
LED current = 132 ×
R SET
The EN/DIM pin has two primary functions. One
function enables and disables the device. The other
function is LED current dimming with six different
TSETUP
levels by pulsing the input signal, as shown on Figure 3.
On each consecutive pulse rising edge, the LED current
is divided by half to 50%, then 25%, 12.5%, 6.25% and
3.125% dimming levels.
Pulses faster than the minimum TLO may be ignored
and filtered by the device. Pulses longer than the
maximum TLO may shutdown the device.
The LED driver enters a “zero current” shutdown mode
if EN/DIM is held low for 1.5ms or more.
TPWRDWN
THI
EN/DIM
TLED
TLO
100%
100%
50%
LED
Current
25%
Shutdown
12.5% 6.25%
3.12%
Shutdown
Figure 3. EN/DIM Digital Dimming Timing Diagram
Table 1. LED Current Dimming Levels
EN/DIM
# of pulses *
RSET Gain
EN = High
LED Current
132
132 × 0.6 V R SET
st
66
66 × 0.6 V R SET
nd
33
33 × 0.6 V R SET
rd
16.5
16.5 × 0.6 V R SET
4
th
8.25
8.25 × 0.6 V R SET
5
th
4.125
4.125 × 0.6 V R SET
6
th
132
th
Device cycling through gain selection
1
2
3
x
132 × 0.6 V R SET
GAIN × 0.6 V R SET
* The gain is changed on the rising edges of the EN/DIM input.
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. 5022, Rev. B
CAT3643
Unused LED Channels
External Components
For applications not requiring all the channels, it is
recommended the unused LED pins be tied directly to
VOUT (see Figure 4).
The driver requires four external 1μF ceramic capaci–
tors for decoupling input, output, and for the charge
pump. Both capacitors type X5R and X7R are
recommended for the LED driver application. In all
charge pump modes, the input current ripple is kept
very low by design and an input bypass capacitor of
1μF is sufficient.
1µF
C1+
VIN
CIN
C2VOUT
In 1x mode, the device operates in linear mode and
does not introduce switching noise back onto the
supply.
COUT
1µF
ENABLE
DIMMING
C1- C2+
VIN
1µF
CAT3643
1µF
EN/DIM
LED1
RSET
LED2
GND
RSET
Recommended Layout
In charge pump mode, the driver switches internally at
a high frequency. It is recommended to minimize trace
length to all four capacitors. A ground plane should
cover the area under the driver IC as well as the
bypass capacitors. Short connection to ground on
capacitors CIN and COUT can be implemented with the
use of multiple via. A copper area matching the TQFN
exposed pad (TAB) must be connected to the ground
plane underneath. The use of multiple via improves
the package heat dissipation.
LED3
Figure 4. Application with 2 LEDs
Protection Mode
If an LED is disconnected, the driver senses that and
automatically ignores that channel. When all LEDs are
disconnected, the driver goes to 1x mode where the
output is equal to the input voltage.
C2
Pin1
As soon as the output exceeds about 6V, the driver
resets itself and reevaluate the mode.
If the die temperature exceeds +150°C, the driver will
enter a thermal protection shutdown mode. When the
device temperature drops by about 20°C, the device
will resume normal operation.
RSET
EN/DIM
C1
LED Selection
COUT
CIN
GND
LEDs with forward voltages (VF) ranging from 1.3V to
4.3V may be used. Selecting LEDs with lower VF is
recommended in order to improve the efficiency by
keeping the driver in 1x mode longer as the battery
voltage decreases.
VIN
GND
VOUT
Figure 5. TDFN-12 Recommended Layout
For example, if a white LED with a VF of 3.3V is
selected over one with VF of 3.5V, the driver will stay
in 1x mode for lower supply voltage of 0.2V. This
helps improve the efficiency and extends battery life.
Doc. No. 5022 Rev. B
12
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3643
PACKAGE OUTLINES
12-LEAD TDFN (HV2), 3mm x 3mm, 0.45mm PITCH
TDFN 12-Lead 3 x 3mm, 0.45mm Pitch
PIN 1 ID
L
PIN 1 INDENT
C
e
D
E2
5xe
b
A1
E
D2
A
RECOMMENDED LAND PATTERN
LAND PATTERN
0.95
SYMBOL
MIN
NOM
MAX
A
A1
b
C
D
D2
E
E2
e
L
0.70
0.00
0.18
0.75
0.02
0.23
0.20 REF
3.00
1.70
3.00
2.40
0.45
0.45
0.80
0.05
0.30
2.90
1.60
2.90
2.30
0.35
0.45
3.10
1.80
3.10
2.50
2.40
0.55
0.23
1.70
3.00
4.00
Notes:
1. All dimensions in millimeters. Angles in degrees.
2. Refer JEDEC MO-229.
Legend:
Package
Land Pattern
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
13
Doc. No. 5022, Rev. B
CAT3643
16 LEAD TQFN (HV3), 3mm x 3mm, 0.5mm PITCH
SYMBOL
MIN
NOM
MAX
A
0.70
0.75
0.80
A1
0.00
0.02
0.05
A3
0.178
0.203
0.228
b
0.18
0.23
0.28
D
2.90
3.00
3.10
D2
1.40
1.55
1.70
E
2.90
3.00
3.10
E2
1.40
1.55
1.70
e
L
0.50 TYP
0.35
0.40
0.45
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1)
(2)
All dimensions are in millimeters, angles in degrees.
Complies with JEDEC Standard MO-220.
Doc. No. 5022 Rev. B
14
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3643
12 Lead XQFN (HL1), 2.5mm x 2.5mm with 0.4mm max height
Pin 1 Dot
By marking
D2
K
PIN #1
INDICATOR
R 0.100
E
E2
BOTTOM VIEW
TOP VIEW
SYMBOL
MIN
NOM
MAX
A
0.36
0.40
A1
0.00
0.01
A2
0.36
0.39
b
0.17
0.20
0.23
D
2.45
2.50
2.55
D2
1.55
1.60
1.65
E
2.45
2.50
2.55
e
A2
A1
A
SIDE VIEW
0.50 BSC
E2
1.55
1.60
1.65
L
0.17
0.20
0.23
K
0.145
0.175
0.205
DETAIL A
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-220.
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
15
Doc. No. 5022, Rev. B
CAT3643
EXAMPLE OF ORDERING INFORMATION
Prefix
CAT
Device #
Suffix
3643
HV3
Product Number
Optional
Company ID
Package
–
T2
Tape & Reel
T: Tape & Reel
2: 2000/Reel
HV2: TDFN
HV3: TQFN
HL1: XQFN
Notes:
(1)
All packages are RoHS-compliant (Lead-free, Halogen-free).
(2)
The standard lead finish is Matte-Tin.
(3)
The device used in the above example is a CAT3643HV3–T2 (TQFN, Tape & Reel).
(4)
For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office.
Doc. No. 5022 Rev. B
16
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
REVISION HISTORY
Date
Rev.
Reason
01/29/2007
A
Initial Release
03/06/2007
B
Electrical Operating Characteristics – Add the pull-down resistor value 100kΩ
Block Diagram – Add a 100kΩ pull-down resistor
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Document No: 5022
Revision:
B
Issue date:
03/06/07
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